<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>margin.html</title>
<style type="text/css">
.one{
    border-style: solid;
    float: unset;
    border-color:darkred;
    }
.two{
    border-top-style: dotted;
    border-bottom-style: dotted;
    border-right-style: double;
    border-left-style: double;
    float: left;
    border-color:sandybrown;
    }
.three{
    border-style:dashed;
    float: right;
    border-color:aqua;
}
.four{
    z-index: 0;
    width: 200px;
    height: 500px;
    border-color: #2991d6;
    border-width: 8px;
    
}
</style>
</head>
<body>
<div class="one">233333<body background="https://so1.360tres.com/t017efb07575589c17f.jpg" 
    style="background-repeat:no-repeat;
    background-attachment:fixed;
    background-size:100% 100%;">
    </body></div>
<div class="two">d545s45</div>
<div class="three">564968</div>
<div class="four">635464</div>
</body>
</html>